Chloride With H2O

Question 1

NaCl in water

• reactivity
• observation
• equation

Answer 1

• no further rn;
• colourless; neutral sol

NaCl(s) -> Na+(aq) + Cl-(aq)

Question 2

MgCl2

• reactivity
• observation
• equation

Answer 2

• very slight hydrolysis
• colourless; acidic sol

[Mg(H2O)6] ^2+ <=> [Mg(H2O)5(OH)] ^+ + H+(aq)

Question 3

AlCl3 in small amt of water

• reactivity
• observation
• equation

Answer 3

• steamy white fume of HCl;
• white solid

AlCl3(s) + 3H2O(l) -> Al(OH)3(s) + 3HCl (g)

Question 4

AlCl3 when more water added

Answer 4

• dissolve with partial hydrolysis
• colourless; acidic

[Al(H2O)6]^3+ (aq) <=> [Al(H2O)5(OH)]^2+ (aq) + H+(aq)

Question 5

SiCl4

• reactivity
• observation
• equation

Answer 5

• complete hydrolysis; strongly acidic sol
• steamy white fume; white solid

SiCl4(l) + 2H2O(l) -> SiO2(s) + 4HCl(g)

Question 6

PCl5

• reactivity
• observation
• equation

Answer 6

• complete hydrolysis;
• colourless and strongly acidic sol;
• steamy white fume

PCl5(s) + 4H20(l) -> H3PO4(aq) + 5HCl(g)

Question 7

Why SiCl4 and PCl5 undergo complete hydrolysis?

Answer 7

Energetically accessible vacant 3D orbitals

-> accept lone pair of electrons from H2O